Study of Tricalcium Phosphate Ceramics Doped with Gadolinium Ions with Various EPR Techniques
Tricalcium phosphate (TCP)-based materials, such as β-Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> doped with rare earth ions (RE), have shown applications as biomaterials, lighting emitting materials, scintillating materials, in vivo imaging probes, and thermolumin...
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MDPI AG
2022-12-01
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| Series: | Ceramics |
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| Online Access: | https://www.mdpi.com/2571-6131/5/4/81 |
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| author | Margarita A. Sadovnikova Fadis F. Murzakhanov Inna V. Fadeeva Anna A. Forysenkova Dina V. Deyneko Georgy V. Mamin Marat R. Gafurov |
| author_facet | Margarita A. Sadovnikova Fadis F. Murzakhanov Inna V. Fadeeva Anna A. Forysenkova Dina V. Deyneko Georgy V. Mamin Marat R. Gafurov |
| author_sort | Margarita A. Sadovnikova |
| collection | DOAJ |
| description | Tricalcium phosphate (TCP)-based materials, such as β-Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> doped with rare earth ions (RE), have shown applications as biomaterials, lighting emitting materials, scintillating materials, in vivo imaging probes, and thermoluminescent dosimeters. Their properties are found to be dependent on the distribution of RE<sup>3+</sup> on Ca<sup>2+</sup> sites that can be controlled by pulsed electron paramagnetic resonance (EPR) and electron spin echo envelop modulation (ESEEM) experiments. The main spectroscopic parameters (spin Hamiltonian values) of Gd<sup>3+</sup> and nitrogen impurity centers are quantitatively determined (g-factor, the fine structure parameters D and E, the hyperfine constants A) as well as dynamic characteristics: spin–lattice T<sub>1</sub> and spin–spin T<sub>2</sub> relaxation times. Based on the analysis of the EPR datasets, the interatomic distance between Gd<sup>3+</sup> and <sup>31</sup>P was estimated in the dipole–dipole approximation. Two structurally nonequivalent Gd<sup>3+</sup> positions in the β-TCP structure have been identified. The obtained valuable results demonstrate applicability of modern EPR techniques to characterize Gd-TCP systems despite the powder structure of the material and high electron spin S = 7/2 of Gd<sup>3+</sup> ions. |
| first_indexed | 2024-03-09T17:12:53Z |
| format | Article |
| id | doaj.art-f48c97cbebd04295abd66016d6de8af0 |
| institution | Directory Open Access Journal |
| issn | 2571-6131 |
| language | English |
| last_indexed | 2024-03-09T17:12:53Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Ceramics |
| spelling | doaj.art-f48c97cbebd04295abd66016d6de8af02023-11-24T13:57:07ZengMDPI AGCeramics2571-61312022-12-01541154116610.3390/ceramics5040081Study of Tricalcium Phosphate Ceramics Doped with Gadolinium Ions with Various EPR TechniquesMargarita A. Sadovnikova0Fadis F. Murzakhanov1Inna V. Fadeeva2Anna A. Forysenkova3Dina V. Deyneko4Georgy V. Mamin5Marat R. Gafurov6Institute of Physics, Kazan Federal University, Kremlevskaya 18, 420008 Kazan, RussiaInstitute of Physics, Kazan Federal University, Kremlevskaya 18, 420008 Kazan, RussiaA.A. Baikov Institute of Metallurgy and Material Science, Russian Academy of Sciences, Leninsky Prospect 49, 119334 Moscow, RussiaA.A. Baikov Institute of Metallurgy and Material Science, Russian Academy of Sciences, Leninsky Prospect 49, 119334 Moscow, RussiaChemistry Department, Lomonosov Moscow State University, 119991 Moscow, RussiaInstitute of Physics, Kazan Federal University, Kremlevskaya 18, 420008 Kazan, RussiaInstitute of Physics, Kazan Federal University, Kremlevskaya 18, 420008 Kazan, RussiaTricalcium phosphate (TCP)-based materials, such as β-Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> doped with rare earth ions (RE), have shown applications as biomaterials, lighting emitting materials, scintillating materials, in vivo imaging probes, and thermoluminescent dosimeters. Their properties are found to be dependent on the distribution of RE<sup>3+</sup> on Ca<sup>2+</sup> sites that can be controlled by pulsed electron paramagnetic resonance (EPR) and electron spin echo envelop modulation (ESEEM) experiments. The main spectroscopic parameters (spin Hamiltonian values) of Gd<sup>3+</sup> and nitrogen impurity centers are quantitatively determined (g-factor, the fine structure parameters D and E, the hyperfine constants A) as well as dynamic characteristics: spin–lattice T<sub>1</sub> and spin–spin T<sub>2</sub> relaxation times. Based on the analysis of the EPR datasets, the interatomic distance between Gd<sup>3+</sup> and <sup>31</sup>P was estimated in the dipole–dipole approximation. Two structurally nonequivalent Gd<sup>3+</sup> positions in the β-TCP structure have been identified. The obtained valuable results demonstrate applicability of modern EPR techniques to characterize Gd-TCP systems despite the powder structure of the material and high electron spin S = 7/2 of Gd<sup>3+</sup> ions.https://www.mdpi.com/2571-6131/5/4/81tricalcium phosphateelectron paramagnetic resonanceESEEMrare-earth ionsgadolinium |
| spellingShingle | Margarita A. Sadovnikova Fadis F. Murzakhanov Inna V. Fadeeva Anna A. Forysenkova Dina V. Deyneko Georgy V. Mamin Marat R. Gafurov Study of Tricalcium Phosphate Ceramics Doped with Gadolinium Ions with Various EPR Techniques Ceramics tricalcium phosphate electron paramagnetic resonance ESEEM rare-earth ions gadolinium |
| title | Study of Tricalcium Phosphate Ceramics Doped with Gadolinium Ions with Various EPR Techniques |
| title_full | Study of Tricalcium Phosphate Ceramics Doped with Gadolinium Ions with Various EPR Techniques |
| title_fullStr | Study of Tricalcium Phosphate Ceramics Doped with Gadolinium Ions with Various EPR Techniques |
| title_full_unstemmed | Study of Tricalcium Phosphate Ceramics Doped with Gadolinium Ions with Various EPR Techniques |
| title_short | Study of Tricalcium Phosphate Ceramics Doped with Gadolinium Ions with Various EPR Techniques |
| title_sort | study of tricalcium phosphate ceramics doped with gadolinium ions with various epr techniques |
| topic | tricalcium phosphate electron paramagnetic resonance ESEEM rare-earth ions gadolinium |
| url | https://www.mdpi.com/2571-6131/5/4/81 |
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